Low temperature thermoplastic material and preparing method thereof

Abstract

A low temperature thermoplastic material is provided. The components include in weight parts: polyurethane with a melting point of 50-70° C. 90-10 parts, poly(ε-caprolactone) 0-90 parts and cross linking co-agent 0.1-6 parts. Compared with the prior poly(ε-caprolactone) low temperature thermoplastic material, the present low temperature thermoplastic material has a smaller shrinking force and a better fastening intensity, is more comfortable and can be stretched more uniformly after molding. Therefore, the material is suitable for hospital and other radiotherapy institution and can be used compatibly with three-dimensional conformal radiotherapy equipments in tumor surgery.

What is claimed is: 
     
       1. A low temperature thermoplastic material, characterized in that it is formed through a method which comprising the steps of:
 1) weighing 90-10 parts of polyurethane having a melting point of 50-70° C., 10-90 parts of polycaprolactone and 0.1-2 parts of crosslinking co-agent as raw materials; 
 2) mixing and homogenizing all the raw materials by stirring; 
 3) heating the mixture to a molten state, followed by sheet forming; and 
 4) performing irradiation by an irradiation dose of 3-30 Kgy. 
 
     
     
       2. The low temperature thermoplastic material according to  claim 1 , characterized in the raw materials comprising in weight parts:
 75-50 parts of polyurethane having a melting point of 50-65° C.; 
 25-50 parts of polycaprolactone; and 
 0.3-2 parts of crosslinking co-agent. 
 
     
     
       3. The low temperature thermoplastic material according to  claim 1 , characterized in that the crosslinking co-agent is monofunctional, bifunctional or multi-functional isooctyl acrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, triallyl isocyanurate, trihydroxymethyl propane triacrylate, pentaerythritol triacrylate or dipentaerythritol hexaacrylate. 
     
     
       4. The low temperature thermoplastic material according to  claim 1 , characterized in that: the heating temperature in steps 3) is 65-160° C. 
     
     
       5. The low temperature thermoplastic material according to  claim 1 , characterized in that: the irradiation ray source in step 4) is high energy electron accelerator, cobalt source, X-ray source or ultraviolet ray source. 
     
     
       6. The low temperature thermoplastic material according to  claim 1 , characterized in that: the irradiation dose in step 4) is 5-20 Kgy. 
     
     
       7. The low temperature thermoplastic material according to  claim 1 , characterized in that: the method further comprises perforating the sheet before the step of performing irradiation.